These were that Piero dei Medici, kinsman and ally of the Orsini, should be reinstated in his ancient power; that six Florentine citizens, to be chosen by Vitellozzo, should be put into his hands that they might by their death expiate that of Paolo Vitelli, unjustly executed by the Florentines; that the Signoria should engage to give no aid to the lord of Piombino, whom Caesar intended to dispossess of his estates without delay; and further, that he himself should be taken into the service of the republic, for a pay proportionate to his deserts.

But just as Caesar had reached this point in his negotiations with Florence, he received orders from Louis XII to get ready, so soon as he conveniently could, to follow him with his army and help in the conquest of Naples, which he was at last in a position to undertake.
Caesar dared not break his word to so powerful an ally; he therefore replied that he was at the king's orders, and as the Florentines were not aware that he was quitting them on compulsion, he sold his retreat for the sum of 36,000 ducats per annum, in exchange for which sum he was to hold three hundred men-at-arms always in readiness to go to the aid of the republic at her earliest call and in any circumstances of need.
But, hurried as he was, Caesar still hoped that he might find time to conquer the territory of Piombino as he went by, and take the capital by a single vigorous stroke; so he made his entry into the lands of Jacopo IV of Appiano.

The latter, he found, however, had been beforehand with him, and, to rob him of all resource, had laid waste his own country, burned his fodder, felled his trees, torn down his vines, and destroyed a few fountains that produced salubrious waters.

This did not hinder Caesar from seizing in the space of a few days Severeto, Scarlino, the isle of Elba, and La Pianosa; but he was obliged to stop short at the castle, which opposed a serious resistance.

As Louis XII's army was continuing its way towards Rome, and he received a fresh order to join it, he took his departure the next day, leaving behind him, Vitellozzo and Gian Paolo Bagliani to prosecute the siege in his absence.
Louis XII was this time advancing upon Naples, not with the incautious ardour of Charles VIII, but, on the contrary, with that prudence and circumspection which characterised him.